why i get this error

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C#

ASP.NET

//i am getting error:

//The type or namespace name 'var' could not be found (are you missing a using directive or an //assembly reference?)

//for this code what is the solution for that??

protected void gvUserInfo_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            con.Open();

            var ddl = (DropDownList)e.Row.FindControl("ddsponcor");
            string sponcorid = e.Row.Cells[0].Text;
            SqlCommand cmd = new SqlCommand("select sponcorid from Registration_Master where sponcorid=" + sponcorid, con);
            SqlDataAdapter da = new SqlDataAdapter(cmd);
            DataSet ds = new DataSet();
            da.Fill(ds);
            con.Close();
            ddl.DataSource = ds;
            ddl.DataTextField = "sponcorid";
            ddl.DataValueField = "sponcorid";
            ddl.DataBind();
            ddl.Items.Insert(0, new ListItem("--Select--", "0"));
        }
    }