c#问题 使用存储，提示错误

[dxinyan]

c#问题：

请教，
strSelect = "declare @content varbinary(16) select @content=TEXTPTR(DDSFile) from cpk.dbo.Tb_TempCheck where ID='" + this.tBID.Text + "' " +
" updatetext cpk.dbo.Tb_TempCheck.DDSFile @content";

            bytContent =br.ReadBytes(intBlock);
        
            sqlcmd.CommandText = strSelect;
            sqlcmd.Parameters.Add("@content", System.Data.SqlDbType.Image).Value = bytContent;
           
            sqlcmd.ExecuteNonQuery();

提示@content有语法错误，请教怎么修改