Using Form control inside a class

-4

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;



namespace Testapp

{

public partial class Form1 : Form

{

    public Form1()

    {

        InitializeComponent();

    }



    private void button1_Click(object sender, EventArgs e)

    {

        EBBill x = new EBBill();

        x.Rent = double.Parse(textBox4.Text);

        x.calcBill();

    }



    partial class EBBill:Form1

    {

        string ownerName;

        double unit;



        public double Rent

        {

            get;

            set;

        }



        public void calcBill()

        {

            double tot;

            unit = double.Parse(textBox3.Text);

            ownerName = textBox1.Text;

            tot = unit * Rent;

            label6.Text = Convert.ToString(tot);

            label7.Text = ownerName;



        }

    }

  }

}

The following is my code. Can somebody tell me what is wrong with it?

I keep getting this UnhandledException error during runtime, which seems to make no sense to me.

The picture is attached for reference. UnhandledException

asked Jan 1 at 17:30

Amit Pandit

3

error is obvious you cannot parse empty string as double... please learn some basics like what is object instance, what is inheritance ... obviously x.textBox3 is not this.textBox3 inside button1_Click

– Selvin
Jan 1 at 17:33

1

Not everything can be parsed to a double. "Hello, Kitty" for instance. Thats why they also make Double.TryParse()

– None of the Above
Jan 1 at 17:39

1

The big reason why the question is downvoted is because it references a picture. It's better to describe in text what the exception is and where it's thrown. It also helps to specify what the exception is. Boiled down, the question is why you're getting a FormatException from double.Parse(textBox3.Text);

– Scott Hannen
Jan 1 at 18:21

Instead of using a TextBox to allow users to set rent values, why not use a NumericUpDown? It's value field is double so no conversion is required.

– Handbag Crab
Jan 1 at 21:21

add a comment |

-4

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;



namespace Testapp

{

public partial class Form1 : Form

{

    public Form1()

    {

        InitializeComponent();

    }



    private void button1_Click(object sender, EventArgs e)

    {

        EBBill x = new EBBill();

        x.Rent = double.Parse(textBox4.Text);

        x.calcBill();

    }



    partial class EBBill:Form1

    {

        string ownerName;

        double unit;



        public double Rent

        {

            get;

            set;

        }



        public void calcBill()

        {

            double tot;

            unit = double.Parse(textBox3.Text);

            ownerName = textBox1.Text;

            tot = unit * Rent;

            label6.Text = Convert.ToString(tot);

            label7.Text = ownerName;



        }

    }

  }

}

The following is my code. Can somebody tell me what is wrong with it?

I keep getting this UnhandledException error during runtime, which seems to make no sense to me.

The picture is attached for reference. UnhandledException

asked Jan 1 at 17:30

Amit Pandit

3

error is obvious you cannot parse empty string as double... please learn some basics like what is object instance, what is inheritance ... obviously x.textBox3 is not this.textBox3 inside button1_Click

– Selvin
Jan 1 at 17:33

1

Not everything can be parsed to a double. "Hello, Kitty" for instance. Thats why they also make Double.TryParse()

– None of the Above
Jan 1 at 17:39

1

The big reason why the question is downvoted is because it references a picture. It's better to describe in text what the exception is and where it's thrown. It also helps to specify what the exception is. Boiled down, the question is why you're getting a FormatException from double.Parse(textBox3.Text);

– Scott Hannen
Jan 1 at 18:21

Instead of using a TextBox to allow users to set rent values, why not use a NumericUpDown? It's value field is double so no conversion is required.

– Handbag Crab
Jan 1 at 21:21

add a comment |

-4

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;



namespace Testapp

{

public partial class Form1 : Form

{

    public Form1()

    {

        InitializeComponent();

    }



    private void button1_Click(object sender, EventArgs e)

    {

        EBBill x = new EBBill();

        x.Rent = double.Parse(textBox4.Text);

        x.calcBill();

    }



    partial class EBBill:Form1

    {

        string ownerName;

        double unit;



        public double Rent

        {

            get;

            set;

        }



        public void calcBill()

        {

            double tot;

            unit = double.Parse(textBox3.Text);

            ownerName = textBox1.Text;

            tot = unit * Rent;

            label6.Text = Convert.ToString(tot);

            label7.Text = ownerName;



        }

    }

  }

}

The following is my code. Can somebody tell me what is wrong with it?

I keep getting this UnhandledException error during runtime, which seems to make no sense to me.

The picture is attached for reference. UnhandledException

asked Jan 1 at 17:30

Amit Pandit

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;



namespace Testapp

{

public partial class Form1 : Form

{

    public Form1()

    {

        InitializeComponent();

    }



    private void button1_Click(object sender, EventArgs e)

    {

        EBBill x = new EBBill();

        x.Rent = double.Parse(textBox4.Text);

        x.calcBill();

    }



    partial class EBBill:Form1

    {

        string ownerName;

        double unit;



        public double Rent

        {

            get;

            set;

        }



        public void calcBill()

        {

            double tot;

            unit = double.Parse(textBox3.Text);

            ownerName = textBox1.Text;

            tot = unit * Rent;

            label6.Text = Convert.ToString(tot);

            label7.Text = ownerName;



        }

    }

  }

}

The following is my code. Can somebody tell me what is wrong with it?

I keep getting this UnhandledException error during runtime, which seems to make no sense to me.

The picture is attached for reference. UnhandledException

c# winforms

asked Jan 1 at 17:30

Amit Pandit

asked Jan 1 at 17:30

Amit Pandit

asked Jan 1 at 17:30

Amit Pandit

asked Jan 1 at 17:30

Amit Pandit

asked Jan 1 at 17:30

Amit Pandit

3

error is obvious you cannot parse empty string as double... please learn some basics like what is object instance, what is inheritance ... obviously x.textBox3 is not this.textBox3 inside button1_Click

– Selvin
Jan 1 at 17:33

1

Not everything can be parsed to a double. "Hello, Kitty" for instance. Thats why they also make Double.TryParse()

– None of the Above
Jan 1 at 17:39

1

The big reason why the question is downvoted is because it references a picture. It's better to describe in text what the exception is and where it's thrown. It also helps to specify what the exception is. Boiled down, the question is why you're getting a FormatException from double.Parse(textBox3.Text);

– Scott Hannen
Jan 1 at 18:21

Instead of using a TextBox to allow users to set rent values, why not use a NumericUpDown? It's value field is double so no conversion is required.

– Handbag Crab
Jan 1 at 21:21

add a comment |

3

error is obvious you cannot parse empty string as double... please learn some basics like what is object instance, what is inheritance ... obviously x.textBox3 is not this.textBox3 inside button1_Click

– Selvin
Jan 1 at 17:33

1

Not everything can be parsed to a double. "Hello, Kitty" for instance. Thats why they also make Double.TryParse()

– None of the Above
Jan 1 at 17:39

1

The big reason why the question is downvoted is because it references a picture. It's better to describe in text what the exception is and where it's thrown. It also helps to specify what the exception is. Boiled down, the question is why you're getting a FormatException from double.Parse(textBox3.Text);

– Scott Hannen
Jan 1 at 18:21

Instead of using a TextBox to allow users to set rent values, why not use a NumericUpDown? It's value field is double so no conversion is required.

– Handbag Crab
Jan 1 at 21:21

error is obvious you cannot parse empty string as double... please learn some basics like what is object instance, what is inheritance ... obviously x.textBox3 is not this.textBox3 inside button1_Click

– Selvin
Jan 1 at 17:33

Not everything can be parsed to a double. "Hello, Kitty" for instance. Thats why they also make Double.TryParse()

– None of the Above
Jan 1 at 17:39

The big reason why the question is downvoted is because it references a picture. It's better to describe in text what the exception is and where it's thrown. It also helps to specify what the exception is. Boiled down, the question is why you're getting a FormatException from double.Parse(textBox3.Text);

– Scott Hannen
Jan 1 at 18:21

Instead of using a TextBox to allow users to set rent values, why not use a NumericUpDown? It's value field is double so no conversion is required.

– Handbag Crab
Jan 1 at 21:21

add a comment |

1 Answer
1

active

oldest

votes

-1

Any text from the text box cannot be parsed to Double,int etc. You should use TryParse() instead.Also always use try, catch block to avoid unhandled exceptions.

answered Jan 1 at 18:13

Ishtiaq

205

Text Box may contain any value e.g some string or it can be empty as well. So obviously such values cannot be converted to double.

– Ishtiaq
Jan 1 at 18:18

Actually, never use try, catch blocks. This will filter out errors and makes your application error prone. Use central error handlers and logging instead.

– Uwe Keim
Jan 1 at 18:29

I am talking about unhandled exceptions @UweKeim

– Ishtiaq
Jan 1 at 18:37

add a comment |

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1 Answer
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1 Answer
1

active

oldest

votes

-1

Any text from the text box cannot be parsed to Double,int etc. You should use TryParse() instead.Also always use try, catch block to avoid unhandled exceptions.

answered Jan 1 at 18:13

Ishtiaq

205

Text Box may contain any value e.g some string or it can be empty as well. So obviously such values cannot be converted to double.

– Ishtiaq
Jan 1 at 18:18

Actually, never use try, catch blocks. This will filter out errors and makes your application error prone. Use central error handlers and logging instead.

– Uwe Keim
Jan 1 at 18:29

I am talking about unhandled exceptions @UweKeim

– Ishtiaq
Jan 1 at 18:37

add a comment |

-1

Any text from the text box cannot be parsed to Double,int etc. You should use TryParse() instead.Also always use try, catch block to avoid unhandled exceptions.

answered Jan 1 at 18:13

Ishtiaq

205

Text Box may contain any value e.g some string or it can be empty as well. So obviously such values cannot be converted to double.

– Ishtiaq
Jan 1 at 18:18

Actually, never use try, catch blocks. This will filter out errors and makes your application error prone. Use central error handlers and logging instead.

– Uwe Keim
Jan 1 at 18:29

I am talking about unhandled exceptions @UweKeim

– Ishtiaq
Jan 1 at 18:37

add a comment |

-1

Any text from the text box cannot be parsed to Double,int etc. You should use TryParse() instead.Also always use try, catch block to avoid unhandled exceptions.

answered Jan 1 at 18:13

Ishtiaq

205

Any text from the text box cannot be parsed to Double,int etc. You should use TryParse() instead.Also always use try, catch block to avoid unhandled exceptions.

answered Jan 1 at 18:13

Ishtiaq

205

answered Jan 1 at 18:13

Ishtiaq

205

answered Jan 1 at 18:13

Ishtiaq

205

answered Jan 1 at 18:13

Ishtiaq

205

Text Box may contain any value e.g some string or it can be empty as well. So obviously such values cannot be converted to double.

– Ishtiaq
Jan 1 at 18:18

Actually, never use try, catch blocks. This will filter out errors and makes your application error prone. Use central error handlers and logging instead.

– Uwe Keim
Jan 1 at 18:29

I am talking about unhandled exceptions @UweKeim

– Ishtiaq
Jan 1 at 18:37

add a comment |

Text Box may contain any value e.g some string or it can be empty as well. So obviously such values cannot be converted to double.

– Ishtiaq
Jan 1 at 18:18

Actually, never use try, catch blocks. This will filter out errors and makes your application error prone. Use central error handlers and logging instead.

– Uwe Keim
Jan 1 at 18:29

I am talking about unhandled exceptions @UweKeim

– Ishtiaq
Jan 1 at 18:37

Text Box may contain any value e.g some string or it can be empty as well. So obviously such values cannot be converted to double.

– Ishtiaq
Jan 1 at 18:18

Actually, never use try, catch blocks. This will filter out errors and makes your application error prone. Use central error handlers and logging instead.

– Uwe Keim
Jan 1 at 18:29

I am talking about unhandled exceptions @UweKeim

– Ishtiaq
Jan 1 at 18:37

add a comment |

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