How can pass value in textbox when itom is selected from comobox

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I want that when user select item from comobox the textbox show the value: e.g:4, 5
EXAMPLE;
when user select "A+" from comobox the textbox1 show "4" automatically.
And i want to do this for many comobox so,please help me :(

What I have tried:

i have tried just like;
float a = (float)Convert.ToDouble(textBox1.Text);
if (comboBox1.Text == "A+")
{

textBox1.Text = "4";
}
but not working

Posted 30-Jul-16 0:32am

Member 12632487

Updated 30-Jul-16 0:56am

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Comments

Richard MacCutchan 30-Jul-16 6:38am

You would be better using a pre-poulated ListBox. You can then just get the currently selected item when the user makes a selection.

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Karthik_Mahalingam · Accepted Answer · 2016-07-30T00:56:00

Solution 1

try like this

C#

private void Form3_Load(object sender, EventArgs e)
      {
          DataTable dt = new DataTable();
          dt.Columns.Add("Value");
          dt.Columns.Add("Text");
          dt.Rows.Add("", "");
          dt.Rows.Add("1", "A");
          dt.Rows.Add("2", "B");
          dt.Rows.Add("3", "C");
          dt.Rows.Add("4", "A+");

          comboBox1.DisplayMember = "Text";
          comboBox1.ValueMember = "Text";
          comboBox1.DataSource = dt;


      }

      private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
      {
          textBox1.Text = (comboBox1.SelectedItem as DataRowView)[0].ToString();
      }

When you select A+ , 4 will assigned to Textbox.

Posted 30-Jul-16 0:56am

Karthik_Mahalingam

Comments

Member 12632487 8-Aug-16 5:12am

Yes it is the better way but in this way how i can pass float type value in the text box .This code is right working but not accept float value.
And other important thing is that , I want to do this for many comobox then in method how i can write code?
need help!

Karthik_Mahalingam 8-Aug-16 5:39am

write a function and pass the parameters, and reuse it.

Member 12632487 8-Aug-16 6:59am

How can pass the parameter. here is the confusion that how can pass the parameter for comobox no?
other thing is how can pass float value?
can you help me by writing small code?

Karthik_Mahalingam 8-Aug-16 7:48am

float value means?
give some example of how ur data looks like and how to do you want to display in the screen

Member 12632487 8-Aug-16 8:51am

same thing i want that you already discuse . mean when user select grade (like A+) then textbox can show (3.4)
as you show that when user select grade "A+" the textbox automatecally show 4
now i want that it can also show the float value like 3.4,4.2 etc

Karthik_Mahalingam 8-Aug-16 9:31am

simple, convert the float value to string and do the same.. it will work..
post your code. i will correct it.

Member 12632487 8-Aug-16 9:54am

here is the code
List<class1> grades = new List<class1>();
grades.Add(new Class1() { Grade = "", point = 0});
grades.Add(new Class1() { Grade = "A+", point = 4 });
grades.Add(new Class1() { Grade = "A", point = 3 });
grades.Add(new Class1() { Grade = "B+", point = 2 });
grades.Add(new Class1() { Grade = "B", point = 1 });
comboBox1.DataSource = grades;
comboBox1.DisplayMember = "grade";

I want that where is the value of point=2 or 3 .....here i can also enter 2.3 or other value like the 3.2,4.2 etc
so help me!

Karthik_Mahalingam 8-Aug-16 12:00pm

put
comboBox1.ValueMember = "point";

Member 12632487 8-Aug-16 12:52pm

i think you dont understand my point.
i want that comobox show grede and textbox show point(like 3,3.4), the code i have sent you is show correct value for comobox and textbox but textbox only show correct value like 2,5,3 but when i asign value (like 3.4,2.3) visual show error.....
code is aboistly right but need to bit improvement ,this code show error when i put the value (2.3,4.5) in point so help me!

Karthik_Mahalingam 8-Aug-16 12:54pm

post the class code (class1)

Karthik_Mahalingam 8-Aug-16 13:03pm

public class Class1
{
public string Grade {get;set;}
public string point {get;set;}
}

List grades = new List();
grades.Add(new Class1() { Grade = "", point = "0"});
grades.Add(new Class1() { Grade = "A+", point = "4.1" });
grades.Add(new Class1() { Grade = "A", point = "3.3" });
grades.Add(new Class1() { Grade = "B+", point = "2.3" });
grades.Add(new Class1() { Grade = "B", point = 1 });
comboBox1.DataSource = grades;
comboBox1.DisplayMember = "grade";
comboBox1.ValueMember = "point";

Member 12632487 8-Aug-16 13:26pm

public string Grade { set; get; }
public string point { set; get; }
List<class1> grades = new List<class1>();
grades.Add(new Class1() { Grade = "", point = 0});
grades.Add(new Class1() { Grade = "A+", point = 4 });
grades.Add(new Class1() { Grade = "A", point = 3 });
grades.Add(new Class1() { Grade = "B+", point = 2 });
grades.Add(new Class1() { Grade = "B", point = 1 });
comboBox1.DataSource = grades;
comboBox1.DisplayMember = "grade";

Karthik_Mahalingam 8-Aug-16 13:27pm

try above code

Member 12632487 8-Aug-16 13:35pm

thanks a lot bro
my program is now right running ..... so thanksssssssssssssss
:)

Karthik_Mahalingam 8-Aug-16 13:42pm

:)

Member 12632487 8-Aug-16 13:29pm

when i write 4.2 in the place of 4 error show "cannot implicitly converted double to string
so try to remove this error , i am so worry due to this :(

Karthik_Mahalingam 8-Aug-16 13:35pm

public class Class1
{
public string Grade {get;set;}
public string point {get;set;}
}

List grades = new List();
grades.Add(new Class1() { Grade = "", point = "0"});
grades.Add(new Class1() { Grade = "A+", point = "4.1" });
grades.Add(new Class1() { Grade = "A", point = "3.3" });
grades.Add(new Class1() { Grade = "B+", point = "2.3" });
grades.Add(new Class1() { Grade = "B", point = "1" });
comboBox1.DataSource = grades;
comboBox1.DisplayMember = "grade";
comboBox1.ValueMember = "point";

Member 12632487 8-Aug-16 13:37pm

error was that i have not write "" for point value
so thank you

Karthik_Mahalingam 8-Aug-16 13:41pm

cool

Member 12632487 8-Aug-16 13:40pm

one thing more
but this code in fundtion how can write ? i mean how can pass parameter for different comobox?
because i need thid code many time

Karthik_Mahalingam 8-Aug-16 13:42pm

all 3 combobox same data?

Member 12632487 8-Aug-16 13:50pm

yes
i have 7 comobox and same data i want to pass

Karthik_Mahalingam 8-Aug-16 13:53pm

public void BindDataToComboBox(ComboBox cbx)
{
List<class1> grades = new List<class1>();
grades.Add(new Class1() { Grade = "", point = "0" });
grades.Add(new Class1() { Grade = "A+", point = "4.1" });
grades.Add(new Class1() { Grade = "A", point = "3.3" });
grades.Add(new Class1() { Grade = "B+", point = "2.3" });
grades.Add(new Class1() { Grade = "B", point = "1" });
cbx.DataSource = grades;
cbx.DisplayMember = "grade";
cbx.ValueMember = "point";
}

BindDataToComboBox(ComboBox1);
BindDataToComboBox(ComboBox2);
BindDataToComboBox(ComboBox3);
BindDataToComboBox(ComboBox4);
BindDataToComboBox(ComboBox5);

Member 12632487 8-Aug-16 14:39pm

where this code write?
i mean where in winform aplication's code?

Karthik_Mahalingam 8-Aug-16 22:37pm

in Form1.cs
inside the class
call this inside form load event
BindDataToComboBox(ComboBox1);
BindDataToComboBox(ComboBox2);
BindDataToComboBox(ComboBox3);
BindDataToComboBox(ComboBox4);
BindDataToComboBox(ComboBox5);

Member 12632487 9-Aug-16 1:16am

IN this way all comoboxs and textboxs have save value.
i mean if comobbox1 have grade A+ and value 4 then all comoboxs have same value.
but i want every comobox and textboxs should have the value according to the grades..... so here is error

Karthik_Mahalingam 9-Aug-16 1:38am

then pass the data in similar manner.

Member 12632487 9-Aug-16 6:56am

thAnks a lot.

Karthik_Mahalingam 9-Aug-16 7:00am

welcome