Must declare the scalar variable "@Sid" error while getting single record from database to gridview

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C#

string cs = ConfigurationManager.ConnectionStrings["dbcs"].ConnectionString;
            SqlConnection cn = new SqlConnection((cs));
            cn.Open();
   SqlCommand cmd = new SqlCommand("select * from Student_Details where Sid=@Sid", cn);  
            SqlDataAdapter da = new SqlDataAdapter(cmd);
            DataSet ds = new DataSet();
            da.Fill(ds);
            cmd.ExecuteNonQuery();
            GridView1.DataSource = ds.Tables[0];
            GridView1.DataBind();

Posted 28-Jun-15 21:20pm

Member 11782598

Updated 28-Jun-15 21:32pm

Suvendu Shekhar Giri

v4

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[no name] 29-Jun-15 3:35am

Please refer to https://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlcommand.parameters(v=vs.110).aspx to understand properly on how to pass parameters to SqlCommand.
I am sure this will give you clear understanding and help you to solve your problem yourself.

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Suvendu Shekhar Giri · Answer 1 · 2015-06-28T21:35:00

Solution 1

You have forgetten to add parameter value before excuting the command.

C#

SqlCommand cmd = new SqlCommand("select * from Student_Details where Sid=@Sid", cn);  
cmd.Parameters.AddWithValue("@Sid", sid);// where sid is the value for parameter @Sid

Hope it helps :)

Posted 28-Jun-15 21:35pm

Suvendu Shekhar Giri

Comments

Member 11782598 29-Jun-15 3:38am

I tried like that also with cmd.parameters command. but i'm not getting any grid view after compiling,just displaying a label which i mentioned for heading to that grid, and not getting any error.