getting Exception as must declare scalar variable

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i am trying to all records of specified teacher in gridview

code is given below

C#

String tea_id12 =Convert.ToString(TextBox1.Text);

SqlDataAdapter da = new SqlDataAdapter("select * from Question where  Teacher_id=@tea_id12", con);
DataSet ds = new DataSet();
da.Fill(ds, "questions");
GridView1.DataSource = ds.Tables[0];
GridView1.DataBind();
//in my Question table colums are question_id,teacher_id,teacher_question,teacher_answer

//i tried for this also

String tea_id12 = Convert.ToString(TextBox1.Text);

SqlDataAdapter da = new SqlDataAdapter("select * from Question,Teacher where Question.Teacher_id=Teacher.Teacher_id and Teacher_id=@tea_id12", con);
DataSet ds = new DataSet();
da.Fill(ds, "questions");
GridView1.DataSource = ds.Tables[0];
GridView1.DataBind();

Posted 20-Mar-14 20:13pm

swati gapat

Updated 20-Mar-14 20:25pm

lukeer

v2

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Comments

lukeer 21-Mar-14 2:26am

Not regarding the exception, but TextBox1.Text is already a string. No need here to convert anything.

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sankarsan parida · Accepted Answer · 2014-03-20T20:24:00

String tea_id12 = Convert.ToString(TextBox1.Text);
  
 SqlDataAdapter da = new SqlDataAdapter("select * from Question,Teacher where Question.Teacher_id=Teacher.Teacher_id and Teacher_id= @tea_id12", con);

da.SelectCommand.Parameters.AddWithValue("tea_id12 ","" + tea_id12 + "");DataSet ds = new DataSet();
 da.Fill(ds, "questions");
 GridView1.DataSource = ds.Tables[0];
 GridView1.DataBind();