delete database row at once

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how to delete database row at single click my code didnt work.

  protected void Delete_Click(object sender, EventArgs e)

{
SqlConnection conn = new     SqlConnection(ConfigurationManager.ConnectionStrings["registrationConnectionString"].ConnectionString);
string sqlStatement = "DELETE * userdata";
SqlCommand com = new SqlCommand(sqlStatement, conn);
conn.Close();
           
}

Posted 11-Feb-15 1:53am

Member 11407981

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Member 10558090 3-Nov-15 9:03am

DELETE statement require a condition.

For example: DELETE FROM [yourTableName] WHERE youcolumn = youvalue.

If you want to delete all data into your table, without remove columns, you can use TRUNCATE statement.

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PauloJuanShirt · Answer 1 · 2015-11-05T01:26:00

Solution 4

Well for a start that is not going to delete a row, but every row.

And you're not calling

C#

com.ExecuteNonQuery();

to do the actual execution.

Posted 5-Nov-15 1:26am

PauloJuanShirt

V Senthil Kumar · Answer 2 · 2015-11-08T20:08:00

Solution 6

string sqlStatement = "DELETE * userdata";

you can use

string sqlStatement = "DELETE From tableName";
(or)
string sqlStatement = "DELETE From userdata";

Posted 8-Nov-15 20:08pm

V Senthil Kumar

v2

hemantsharma1 · Answer 3 · 2015-11-08T20:25:00

XML

I guess you want to delete all rows from table so correct the command first as
<pre lang="c#">protected void Delete_Click(object sender, EventArgs e)

{
SqlConnection conn = new     SqlConnection(ConfigurationManager.ConnectionStrings["registrationConnectionString"].ConnectionString);
string sqlStatement = "DELETE * from  userdata";
SqlCommand com = new SqlCommand(sqlStatement, conn);
cmd.ExecuteNonQuery();//have to execute above command query
conn.Close();

}</pre>

Reply if any query or mark as solution

Herman<T>.Instance · Answer 4 · 2015-02-11T01:57:00

Solution 1

Here[^] a pretty good solution/explanation.

Posted 11-Feb-15 1:57am

Herman<T>.Instance

Arasappan · Answer 5 · 2015-11-05T01:09:00

Solution 3

Use Where condition ....

string sqlStatement = "DELETE from userdata whsre ID_of_the_row=the rows id u need to delete ";
SqlCommand com = new SqlCommand(sqlStatement, conn);
Com.ExecuteNonQuery();

Posted 5-Nov-15 1:09am

Arasappan

Updated 5-Nov-15 1:53am

v4

Comments

phil.o 5-Nov-15 7:17am

Absolutely not. The syntax is DELETE FROM [Table], not DELETE * [Table].

Arasappan 5-Nov-15 7:52am

Phil by mistake i forget to replace the *

Arasappan 5-Nov-15 7:54am

dont know y they are downvoting

Member 10925851 · Answer 6 · 2015-11-06T00:24:00

protected void Delete_Click(object sender, EventArgs e)
{
SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["registrationConnectionString"].ConnectionString);
string sqlStatement = "DELETE * userdata";
SqlCommand com = new SqlCommand(sqlStatement, conn);
com.ExecuteNonQuery();
conn.Close();

}