Pass parameter as
SqlConnection conn = new SqlConnection(strcon);
conn.Open();
SqlCommand cmd=new SqlCommand("select Image, ImageName from Img where ([Date] = @date) ", conn);
cmd.Parameters.AddWithValue("date",datevalue);
SqlDataAdapter Sqa = new SqlDataAdapter(cmd);
DataSet ds = new DataSet();
Sqa.Fill(ds);
GridView1.DataSource = ds;
GridView1.DataBind();
conn.Close();
datevalue will be value of date that you want to pass in query