Data Retriving problem in C#

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I am doig Project In C# with database,,
Here is my Code...

C#

SqlDataAdapter da = new SqlDataAdapter("Select ID,DrugName,PurchasePrice,SellPrice,Stock from AddProduct where DrugName ='" + comboBox1.SelectedItems + "'", conn);
DataTable dt = new DataTable();
da.Fill(dt);
textBox1.Text = (dt.Rows[0]["ID"].ToString());
textBox2.Text = dt.Rows[1]["DrugName"].ToString();
textBox3.Text = (dt.Rows[2]["PurchasePrice"].ToString());
textBox4.Text = (dt.Rows[3]["SellPrice"].ToString());
textBox6.Text = (dt.Rows[4]["Stock"].ToString());

And these error occur:
The data types ntext and varchar are incompatible in the equal to operator.
Please help, what can i do?

Posted 10-Aug-12 15:46pm

Arsalaan Ahmed

Updated 10-Aug-12 15:52pm

JF2015

v2

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Comments

Kenneth Haugland 10-Aug-12 22:01pm

comboBox1.SelectedItems ? How about SelectedItem.Name.ToString or somthing simular?

[no name] 11-Aug-12 1:16am

And do not use string concatenation to construct SQL queries.

3 solutions

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Thilina Chandima · Answer 1 · 2012-08-10T16:06:00

Solution 1

C#

SqlDataAdapter da = new SqlDataAdapter("Select ID,DrugName,PurchasePrice,SellPrice,Stock from AddProduct where DrugName ='" + comboBox1.SelectedText + "'", conn);

use selectedText and try again

Posted 10-Aug-12 16:06pm

Thilina Chandima

Updated 10-Aug-12 16:07pm

v2

Comments

Volynsky Alex 11-Aug-12 3:43am

Good answer

Deepak_Sharma_ · Answer 2 · 2012-08-10T19:01:00

Solution 2

Hi,
This error comes when you use equal to"=" operator with text, ntext or image columns. If your column is of these datatype change it to nvarchar(max) or varchar(max)

Posted 10-Aug-12 19:01pm

Deepak_Sharma_

javedk09 · Answer 3 · 2012-08-10T23:26:00

Solution 3

SqlDataAdapter da = new SqlDataAdapter("Select ID,DrugName,PurchasePrice,SellPrice,Stock from AddProduct where DrugName ='" + comboBox1.SelectedText + "'", conn);

Posted 10-Aug-12 23:26pm

javedk09