How to Change a DataColumn's Data Type from Double to Int32 in a DataTable?

Convert DataColumn data type in DataTable

When processing data in programming, you may need to manipulate the data types of columns in the DataTable. This article discusses how to modify the data type of a DataColumn, specifically from Double to Int32.

Consider the following example where a DataTable is populated with data from a database query:

<code>DataTable Table = new DataTable();
SqlConnection = new System.Data.SqlClient.SqlConnection("Data Source=" + ServerName + ";Initial Catalog=" + DatabaseName + ";Integrated Security=SSPI; Connect Timeout=120");

SqlDataAdapter adapter = new SqlDataAdapter("Select * from " + TableName, Connection);
adapter.FillSchema(Table, SchemaType.Source);
adapter.Fill(Table);

DataColumn column = DataTable.Columns[0];</code>

After the data is loaded into the DataTable, the DataType of the first column column is Double. The goal is to change this data type to Int32.

However, it is important to note that once the DataTable is populated with data, you cannot directly change the DataType of the DataColumn. Modifications must be made by other methods, as follows:

Solution:

One way to achieve the desired data type conversion is to clone an existing DataTable and modify the data type in the cloned table. This can be done using the following steps:

<code>DataTable dtCloned = dt.Clone();
dtCloned.Columns[0].DataType = typeof(Int32);
foreach (DataRow row in dt.Rows) 
{
    dtCloned.ImportRow(row);
}</code>

In this code, the dtCloned variable represents a cloned DataTable with the data type of the first column modified. The data from the original DataTable is then imported into the cloned table, ensuring that the values ​​are preserved in the process. This method allows the DataColumn's data type to be modified while maintaining data integrity.

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