我使用以下代码将输入到 Web 表单的反馈添加到数据库中。
代码工作正常。但是当我尝试删除这个语句时
SqlCommandBuilder objcb = new SqlCommandBuilder(objDa);
我收到一个错误,我的意思是它正在执行 else 部分。
谁能告诉我SqlCommandBuilder 有什么用?
protected void btnSubmit_Click(object sender, EventArgs e)
{
if (txtName.Text.Trim() == "")
{
Response.Write("<script>alert ('Name Field cannot be left blank')</script>");
return;
}
if (txtFeedBack.Text.Trim() == "")
{
Response.Write("<script>alert('FeedBack Field cannot be left blank')</script>");
return;
}
objSqlConnection.ConnectionString = connectionStringSetting;
objSqlConnection.Open();
try
{
SqlDataAdapter objDa = new SqlDataAdapter("select * from FeedBack", objSqlConnection);
SqlCommandBuilder objcb = new SqlCommandBuilder(objDa);
DataSet objDs = new DataSet("FeedBack");
objDa.Fill(objDs, "FeedBack");
DataRow dr = objDs.Tables["FeedBack"].NewRow();
dr[1] = txtName.Text;
dr[2] = txtAddress.Text;
dr[3] = txtCity.Text;
dr[4] = txtCountry.Text;
dr[5] = txtEmail.Text;
dr[6] = Convert.ToInt32(txtContactNo.Text);
dr[7] = txtFeedBack.Text;
objDs.Tables["FeedBack"].Rows.Add(dr);
objDa.Update(objDs, "FeedBack");
Response.Write("<script>alert('Your FeedBack has been submitted')</script>");
objSqlConnection.Close();
}
catch (Exception)
{
Response.Write("<script> alert('Error on Page. Please try after sometime')</script>");
objSqlConnection.Close();
}
有没有办法显示特定的错误消息,例如如果用户输入字符串值而不是整数值,它应该将消息显示为“输入字符串没有以正确的格式输入?