plz solve this Error into search data by combobox

Question

3.00/5 (2 votes)

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Search Data from database by combobox into datagridview
my table:- uid navarchar(50)[Datatype]
Name Varchar(50)[Datatype]// dispalyname in combobox

ERROR:- Invalid column name 'mb08'(uid).

C#

private void comboBox2_SelectedIndexChanged(object sender, EventArgs e)
       {

           string qry = "select * from tbmobile where uid=" + comboBox2.SelectedValue;
           SqlDataAdapter da = new SqlDataAdapter( qry,con);
           DataTable dt = new DataTable();
           da.Fill(dt);
           dataGridView1.DataSource = dt;
           dataGridView1.Refresh();
       }

Posted 19-Aug-14 22:36pm

Nishant.Chauhan80

Updated 19-Aug-14 22:57pm

v3

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Comments

Ashi0891 20-Aug-14 4:45am

check the query again. make sure you have correct table name and column name in your sql query. other than that try giving some value to uid that exists in the table and try to execute it in sqlserver itself.

Richard MacCutchan 20-Aug-14 6:58am

Like I said before, use proper parameterized queries. Do not use string concatenation to build your commands.

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Richard MacCutchan · Answer 1 · 2014-08-19T22:53:00

Solution 1

You should use SelectedItem as described here[^]. You should also be using proper parameterised queries, especially as you have no idea what will be returned from the combobox.

Posted 19-Aug-14 22:53pm

Richard MacCutchan

DineshMaind · Answer 2 · 2014-08-20T00:35:00

Solution 2

Try following changes in your code.

C#

string qry = "select * from tbmobile where uid='" + comboBox2.SelectedValue + "'";

Hope it will work.

Posted 20-Aug-14 0:35am

DineshMaind

Comments

Bernhard Hiller 20-Aug-14 7:08am

Works, though I'd recommend a parameterized query. And that would have avoided this problem already...

Sharmanuj 20-Aug-14 8:20am

You should use the following query.
string qry = "select * from tbmobile where uid='" + comboBox2.SelectedValue.ToString() + "'";

ComboBox.SelectedValue should be converted into String.