Controlling the value of textBox by combobox selection using c# and sql

Question

4.00/5 (1 vote)

See more:

SQL-Server-2005

C#3.0

C#

, +

I want to control the value of textbox through comboox selection.My coding is:

C#

private void Form1_Load(object sender, EventArgs e)
       {
           SqlDataAdapter ad = new SqlDataAdapter("select *from Reg",con);
           DataSet ds = new DataSet();
           ad.Fill(ds, "Reg");
           comboBox1.DataSource = ds.Tables["Reg"].DefaultView;
           comboBox1.DisplayMember = "name";
           comboBox1.ValueMember = "name";

       }
private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
       {
           SqlDataAdapter ad = new SqlDataAdapter("select *from Reg where name='" + comboBox1.SelectedItem.ToString()+ "'", con);
           DataSet ds = new DataSet();
           ad.Fill(ds, "Reg");
           dataGridView1.DataSource = ds.Tables["Reg"].DefaultView;
           textBox1.Text = ds.Tables["Reg"].Rows[0]["Email"].ToString();

       }

But it is showing one error.That error is : There is no row at position 0.

Sir please give solution

Posted 3-Apr-11 20:36pm

Banajyotsna

Updated 3-Apr-11 20:42pm

DaveAuld

v2

Add a Solution

Comments

DaveAuld 4-Apr-11 2:43am

Edit: Code Formatting added.

DaveAuld 4-Apr-11 2:46am

Are there any rows returned by the query? if the answer to this is yes, them did you try increaing the index number to Rows[1] and see if that works? it might give you a clue to what the base index value is.

Banajyotsna 4-Apr-11 2:52am

When i changed the index number to Rows[1] it is showing the error : There is no row at position 1.

4 solutions

Solution 3

http://social.msdn.microsoft.com/Forums/en/Vsexpressvb/thread/8844df20-9c56-47b5-8023-3d5b38d454d2[^]
I hope the above information will be helpful. If you have more concerns, please let me know.

Posted 3-Apr-11 20:59pm

Monjurul Habib

Solution 1

I think you should use

SqlDataAdapter ad = new SqlDataAdapter("select *from Reg where name='" + comboBox1.SelectedValue.ToString()+ "'", con);

in stead of

SqlDataAdapter ad = new SqlDataAdapter("select *from Reg where name='" + comboBox1.SelectedItem.ToString()+ "'", con);

Hope it helps, Good luck!

Eduard

Posted 3-Apr-11 20:46pm

Eduard Keilholz

Comments

Banajyotsna 4-Apr-11 2:50am

It is showing same error only

Banajyotsna 4-Apr-11 2:51am

when i used comboBox1.SelectedValue.ToString() then also it is showing same error.

Solution 4

Thanx i have been looking for that for the past 8 hours. Stay blessed

Posted 15-Jun-12 7:29am

Member 9115849

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Kirankumar Ballapalli · Accepted Answer · 2011-04-03T20:50:00

Hi,

Please rechange the your code as follows.

private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
  {
    SqlDataAdapter ad = new SqlDataAdapter("select *from Reg where name='" + comboBox1.SelectedItem.ToString()+ "'", con);
     DataSet ds = new DataSet();
     ad.Fill(ds, "Reg");
     dataGridView1.DataSource = ds.Tables["Reg"].DefaultView;
     if(ds.Tables["Reg"].Rows.Count > 0)
       {
            textBox1.Text = ds.Tables["Reg"].Rows[0]["Email"].ToString();
       }
    else
      {
        textBox1.Text="";
      }
            
   }

If the selected combo box value is not there in database,it will return zero rows.
Thats why you are getting this kind of error.
I hope it will solve your problem.

Regards,
Kiran.