我的页面上有一些文本框。我正在页面加载中从数据库中获取值并更新文本框。我有一个代码来更新更新按钮后面的数据库中的值。问题是，当我更改文本框值并单击“更新”按钮时，文本框中的值再次是原始值。它保留了其价值。我的代码是
protected void Page_Load(object sender, EventArgs e)
{
int id = Convert.ToInt32(Session["DocumentID"]);
Connection conn = new Connection();
string query = "SELECT * from Document where DocumentID='" + id + "'";
SqlCommand sqlcom = new SqlCommand(query, conn.conopen());
SqlDataAdapter daexp = new SqlDataAdapter(sqlcom);
System.Data.DataTable dtexp = new System.Data.DataTable();
daexp.Fill(dtexp);
TextBox1.Text = dtexp.Rows[0][1].ToString();
TextBox3.Text = dtexp.Rows[0][2].ToString();
TextBox6.Text = dtexp.Rows[0][3].ToString();
TextBox4.Text = dtexp.Rows[0][4].ToString();
TextBox5.Text = dtexp.Rows[0][5].ToString();
TextBox7.Text = dtexp.Rows[0][6].ToString();
TextBox7.ReadOnly = true;
}
protected void Button1_Click(object sender, EventArgs e)
{
int id = Convert.ToInt32(Session["DocumentID"].ToString());
if (FileUpload1.HasFile)
{
HttpPostedFile Image = FileUpload1.PostedFile;
string contentType = Image.ContentType;
if (contentType.Equals("application/octet-stream"))
{
contentType = "application/pdf";
}
else if (contentType.Equals("application/vnd.openxmlformats-officedocument.wordprocessingml.document"))
{
contentType = "application/msword";
}
int nFileLen = Image.ContentLength;
byte[] myData = new byte[nFileLen];
Image.InputStream.Read(myData, 0, nFileLen);
Connection con = new Connection();
con.conopen();
string query = "UPDATE Document SET Setup='" + TextBox1.Text + "', ReferenceNO='" + TextBox3.Text + "', DocumentDate='" + TextBox6.Text + "', Subject='" + TextBox4.Text + "', NameOfInitiator='" + TextBox5.Text + "', Document=@Doc, FolderID='" + DropDownList1.Text + "', DocTypeID='" + DropDownList4.Text + "', DirectorateID='" + DropDownList3.Text + "', OrganizationID='" + DropDownList2.Text + "' WHERE DocumentID='" + id + "'";
SqlCommand sqlcom = new SqlCommand(query, con.conopen());
sqlcom.Parameters.AddWithValue("@Doc", myData);
sqlcom.ExecuteNonQuery();
Label12.Text = "Document Updated Successfully";
Label12.ForeColor = System.Drawing.Color.Green;
Label12.Visible = true;
Label12.Text = "Document Updated Successfully";
Label12.ForeColor = System.Drawing.Color.Green;
Label12.Visible = true;
}
else
{
Connection conn = new Connection();
string query = "UPDATE Document SET Setup='" + TextBox1.Text + "', ReferenceNO='" + TextBox3.Text + "', DocumentDate='" + TextBox6.Text + "', Subject='" + TextBox4.Text + "', NameOfInitiator='" + TextBox5.Text + "', FolderID='" + DropDownList1.Text + "', DocTypeID='" + DropDownList4.Text + "', DirectorateID='" + DropDownList3.Text + "', OrganizationID='" + DropDownList2.Text + "' WHERE DocumentID='" + id + "'";
SqlCommand sqlcom = new SqlCommand(query, conn.conopen());
sqlcom.ExecuteNonQuery();
}
}
您正在从中更新数据库中文本框的值Page_Load。每次回发页面时，它都会从数据库获取值并在TextBoxes中进行设置。如果页面是第一次加载而不是回发，则只需添加检查并仅更新值并将其设置为TextBoxes。像这样：
protected void Page_Load(object sender, EventArgs e)
{
if(!Page.IsPostBack)
{
//your code here...
}
}
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